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In graphene, we have investigated the pump-inducedanisotropy of the carrier distribution upon excitation with linearly polarizedlight. Since optical-phonon scattering is suppressed at THz frequencies and lowtemperatures, we observe the decay of this anisotropy to be very slow, as longas several ps, which is theoretically explained by non-collinear Coulombscattering. We also report on degenerate four-wave mixing experiments inLandau-quantized graphene to investigate the induced coherent polarization.